javascript shorthand

#http://www.sitepoint.com/shorthand-javascript-techniques/

1. If true … else Shorthand

var big = (x > 10) ? true : false;
var big = (x > 10);
 
//further nested examples
var x = 3,
big = (x > 10) ? "greater 10" : (x < 5) ? "less 5" : "between 5 and 10";
console.log(big); //"less 5"
 
var x = 20,
big = {true: x>10, false : x< =10};
console.log(big); //"Object {true=true, false=false}"

2. Object Array Notation Shorthand

var a = ["myString1", "myString2", "myString3"];

3. Associative Array Notation Shorthand

var skillSet = {
    'Document language' : 'HTML5',
    'Styling language' : 'CSS3',
    'Javascript library' : 'jQuery',
    'Other' : 'Usability and accessibility'
};

4. Declaring variables Shorthand

var x, y, z=3;

5. Assignment Operators Shorthand

x++; //x=x+1;
minusCount --; //minusCount = minusCount - 1;
y*=10; //y=y*10;
x += y //result x=15
x -= y //result x=5
x *= y //result x=50
x /= y //result x=2
x %= y //result x=0

6. RegExp Object Shorthand

var result = /d+(.)+d+/igm.exec("padding 01234 text text 56789 padding");
console.log(result); //"01234 text text 56789"

7. If Presence Shorthand

if (likeJavaScript) //if (likeJavaScript === true)

var a;
if ( !a ) {
// do something...
}

8. Function Variable Arguments Shorthand

function myFunction() {
    console.log( arguments.length ); // Returns 5
    for ( i = 0; i < arguments.length; i++ ) {
        console.log( typeof arguments[i] ); // Returns string, number, object, object, boolean
    }
}
myFunction( "String", 1, [], {}, true );

9. JavaScript foreach Loop Shorthand

for(var i in allImgs)

Shorthand for Array.forEach:

function logArrayElements(element, index, array) {
    console.log("a[" + index + "] = " + element);
}
[2, 5, 9].forEach(logArrayElements);
// logs:
// a[0] = 2
// a[1] = 5
// a[2] = 9

10. Switch Knightmare

var cases = {
    1: doX,
    2: doY,
    3: doN
};
if (cases[something]) {
    cases[something]();
}

11. Shorter IF’z

if([1,5,7,22].indexOf(myvar)!=-1) alert('yeah baby!') //if( myvar==1 || myvar==5 || myvar==7 || myvar==22 ) alert('yeah')